Hydrocracking Catalyst Containing Beta and Y Zeolites, and Process For Its Use to Produce Naphtha

Abstract

Increased yields of naphtha and increased catalyst activity are obtained in a hydrocracking process by the use of a catalyst containing a beta zeolite and a Y zeolite having a unit cell size from 24.38 to 24.50 angstrom. The catalyst has a relatively high amount of Y zeolite relative to beta zeolite.

1 . A composition of matter comprising a catalyst comprising a hydrogenation component, a beta zeolite, and a Y zeolite having a unit cell size from 24.38 to 24.50 angstrom, the catalyst having a weight ratio of Y zeolite to beta zeolite of from 5 to 12 on a dried basis. 
   
   
       2 . The composition of  claim 1  wherein the Y zeolite is an LZ-210 zeolite. 
   
   
       3 . The composition of  claim 1  wherein the Y zeolite has an overall silica to alumina mole ratio from 5.0 to 11.0. 
   
   
       4 . The composition of  claim 1  wherein the Y zeolite is prepared by a process comprising the steps of:
 a) partially ammonium exchanging a sodium Y zeolite;   b) calcining the zeolite resulting from step (a) in the presence of water vapor;   c) ammonium exchanging the zeolite resulting from step (b); and   d) calcining the zeolite resulting from step (c) in the presence of water vapor.   
   
   
       5 . The composition of  claim 1  wherein the hydrogenation component is selected from the group consisting of molybdenum, tungsten, nickel, cobalt, and the oxides and sulfides thereof.